DEAN, ROBERT AARON. b. Marshall Co., MS, 29 Dec 1836. SGT, Co. I, 19th MS, 25 May 1861. LT, 17 Jul 1861. CPT, 16 Apr 1863, to rank from 15 Jul 1862. MAJ, 12 May 1864. Paroled at Memphis, TN, May 1865. m. Lucy Ann LANGSTON, 1864. In MS Legislature. Alive in 1912. Source: Krick, Robert K., LEE'S COLONELS: A BIOGRAPHICAL REGISTER OF THE FIELD OFFICERS OF THE ARMY OF NORTHERN VIRGINIA, (Dayton, OH: 1979), p. 102.

Hope this helps a little.